MONKEY SPANNER

PROBLEM TO BE SOLVED: To provide a monkey spanner capable of being used with feeling similar to a normal monkey spanner in a case of a small nut and a bolt, and capable of performing work at the half turning angle of the angle required for a normal bolt and a nut in a case of a relative large nut and a bolt. SOLUTION: In a monkey spanner 10 in which a moving jaw body 13 is slid and moved in relation to a fixed jaw body 12 by turning an operating screw 17, and the distance between respective parallel contact parts 14, 15 can be changed to the size of an object such as the bolt head part or a nut, opposing triangular grooves 19, 20 to which corner parts 24, 23 of the object are to be fitted are formed on the contact part 14 of the fixed jaw body 12 and the contact part 15 of the moving jaw body 13 halfway in relation to the width (W) direction of respective contact parts 14, 15.